【摘要】 本文介绍了北京天文台红外光学望远镜的主光路系统的光学质量,方法是以二维哈特曼检验为基础,推导并计算出一系列的评价光学质量的结果,例如点扩散函数,光学传递函数,斯特列尔(Strehl)数等等,作为评价天文光学望远镜的质量标准.更多还原

【Abstract】 This paper introduces the optical quality of Cassegrain system for 1.2 M Infrared Telescope of Beijing Observatory. The test method is based on two dimensional Hartmann quantitative test. First we get the spot diagram at the best focus and the energy distribution curve. Because of only one star on the field of the object plane of the telescope, we can draw a conclusion from it, that is to say, this spot is also the PST of the optical telescope which shows the energy distribution of a star on the focal plane, then we can get the one and two dimensional plots of the MTF which show the imaging character of the optical system for different bands of the receiver and different space frequences of the object, and the Strehl number which shows the ratio of real/ideal of energy at the center point of the image. At the same time, still starting from this spot diagram, we can obtain a series of results about evaluating optical quality as the quality standards of evaluating astronomical optical telescope through computing, for example, the plots of optical path differences which show the wavefront error, the Zernike coefficient which shows the aberration, the real focal length of this optical system, the RMS and the P-V error of the wavefront, and the average radius of the image etc.更多还原